David L Ryan/globe staff

Congressional primary voting took place Thursday in the state, where 52 percent of registered voters do not align themselves with any political party.

Bill Greene/globe staff

Elizabeth Childs called voters from her Brookline home.

David L Ryan/globe staff

Joe Kennedy III greeted supporters Thursday morning at Brookline High School.

wendy maeda/globe staff

Republican candidate Sean Bielat, right, greeted supporters after voting at the Norfolk Olive Day School in Norfolk.

Stephan Savoia/associated press

Elizabeth Warren voted at the Graham & Parks School in Cambridge.

Steve Haines for the boston globe

Congressman Bill Keating and his wife, Tevis, left, voted at St. John's Parish Center in Pocasset.